oracle - Can I slice a PL/SQL collection?

Question

I've got a PL/SQL VArray that I'm filling with a BULK COLLECT query like this:

SELECT id
BULK COLLECT INTO myarray
FROM aTable

Now I'd like to pass a slice of this collection into another collection, something like this:

newarray := myarray(2..5)

This should pass the elements 2,3,4 and 5 from myarray to newarray.

I could write a loop and copy the elements, but is there a more compact way to do this?

Answer 1

通常，您不想这样做。您在内存中有一个大集合，现在您想要复制它。那将使用更多的内存。通常在这种情况下，您传递整个集合（通过引用，而不是值）并且还提供开始和停止索引。将其留给其他函数以仅处理指定的范围。